Somatosensory Evoked Potentials questions with correct answers

Spinal Recording Site for lower SSEPs - Answer T10-T12 and generates the lumbar potential Cervical recording site for lower SSEPs - Answer Typically at cervical vertebra 5 Alternative recording sites for SSEP - Answer A1/A2 or M1/M2 to reference Peripheral recording site for upper SSEPs - Answer Erb's point Erb's point - Answer records a propagating signal from the Brachial Plexus -this data point is often useful in detecting positioning effect Upper recording cervical site for SSEPs - Answer Typically at the cervical vertebra 5 Alternative cervical site for upper SSEPs - Answer the brainstem for cervical surgeries and includes A1/A2 or M1/M2 to reference Post Tib Cortical recording: Montage (waveforms) for cortical recording of lower EPs include - Answer Cz' as the active input and Fpz as the referential C3' and C4' as a bipolar trans-cranial recording Paradoxical Lateral Localization - Answer Response localization on the head -this means that the largest P37 response is ipsilateral to side of stimulation